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Ferret is an information retrieval library in the same vein as Apache Lucene. Originally it was a full port of Lucene but it now uses it's own file format
and indexing algorithm although it is still very similar in many ways to Lucene. Everything you can do in Lucene you should be able to do in Ferret.

PyLucene is a Python extension for accessing Java Lucene. Its goal is to allow you to use Lucene's text indexing and searching capabilities from Python. It is API compatible with the latest version of Java Lucene, PyLucene is not a Lucene port but a Python wrapper around Java Lucene. PyLucene embeds a Java VM with Lucene into a Python process.

CLucene is a port of the very popular Java Lucene text search engine API. CLucene aims to be a good alternative to Java Lucene when performance really matters or if you want to stick to good old C++. CLucene is faster than Lucene as it is written in C++, meaning it is being compiled into machine code, has no background GC operations, and requires no any extra setup procedures.

This project hosts Solr/Lucene in Windows Azure using multi-instance replication for index-serving and single-instance for index generation with a persistent index mounted in Azure storage. Typical scenarios could be a commercial and publisher sites that need to scale the traffic with increasing query volume and need to index maximum 16 TB of data and require couple of index updates per day.

With the continuous efforts of adjusting search results to focused target audieces, there's an increasing demand for incorporating geographical location information into the standard search functionality. Spatial Solr Plugin (SSP) is a free, standalone plug-in which enables Geo / Location Based Search, and is built on top of the open source projects Apache Solr and Apache Lucene.

evaSearch is a open source enterprise server for indexing documents on local and share folders. Then you can quickly find your files using many user interfaces like a Web site or a console application.

ActiveDocument is a library that serves to persist entities to/from a Lucene.Net index via a simple attribute based mapping system. It also provides a base class for your classes to extend providing rich functionality out of the box, such as finding by id, by query, finding r...